ReactOS - A Reflection Of Windows Of Old

Remember Windows 2000 and Server 2003? I have a soft spot for Windows 2000 myself, but yeah I recall those golden oldies. Curiously enough, there is actually an open source, free version of those flavors of Windows; ReactOS. It's not Linux, it is a Windows clone - it's a bit crash-y, and in alpha, but it lives...
While ReactOS' source availability and current usage is mostly intended for programmers to expand and improve on, you don't need to be a rocket scientist to use it, and in its final state will be a consumer friendly OS. If you've used Windows before, you'll find yourself in a familiar environment with ReactOS. The learning curve, if any, should be minimal, since ReactOS duplicates many of the Windows graphical environment applets, control panels and dialogs (Windows 2000/XP/2003).